noun
axiom
AK-see-um/ˈæksiəm/
A statement accepted as true as a basis for reasoning.
The proof begins with an axiom accepted throughout the mathematical system.

Etymology
Greek axioma meant something thought worthy or fit, hence “authority.” This connects an axiom’s self-evident truth with its standing as a statement worthy of acceptance.
In context
it is an axiom admitted by all economists that peace without and peace within are necessary for the progress of Commerce and Industry
More examples
- Different geometries can be built from different axioms.
- She challenged the familiar axiom that bigger is always better.
- An axiom provides a starting point rather than a conclusion.
Forms
axiom · axioms
axiomatic adjective — Accepted as a basic truth without proof.